While on the subject, I am trying to find out where to drill the holes in the firewall for the motor mounts on an inverted YS F91 4 stroke going in a cap 232. I am not sure because they have always been predrilled. I have the picture of the firewall with the lines drawn but it does not make a whole lot of sense to me. Help anyone. The book says to make it inverted. My ucando 3d flys fine like that.